/*

 * jpegtran.c

 *

 * Copyright (C) 1995, Thomas G. Lane.

 * This file is part of the Independent JPEG Group's software.

 * For conditions of distribution and use, see the accompanying README file.

 *

 * This file contains a command-line user interface for JPEG transcoding.

 * It is very similar to cjpeg.c, but provides lossless transcoding between

 * different JPEG file formats.

 */



#include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */

#include "jversion.h"		/* for version message */



#ifdef USE_CCOMMAND		/* command-line reader for Macintosh */

#ifdef __MWERKS__

#include <SIOUX.h>              /* Metrowerks declares it here */

#endif

#ifdef THINK_C

#include <console.h>		/* Think declares it here */

#endif

#endif





/*

 * Argument-parsing code.

 * The switch parser is designed to be useful with DOS-style command line

 * syntax, ie, intermixed switches and file names, where only the switches

 * to the left of a given file name affect processing of that file.

 * The main program in this file doesn't actually use this capability...

 */





static const char * progname;	/* program name for error messages */

static char * outfilename;	/* for -outfile switch */





LOCAL void

usage (void)

/* complain about bad command line */

{

  fprintf(stderr, "usage: %s [switches] ", progname);

#ifdef TWO_FILE_COMMANDLINE

  fprintf(stderr, "inputfile outputfile\n");

#else

  fprintf(stderr, "[inputfile]\n");

#endif



  fprintf(stderr, "Switches (names may be abbreviated):\n");

#ifdef ENTROPY_OPT_SUPPORTED

  fprintf(stderr, "  -optimize      Optimize Huffman table (smaller file, but slow compression)\n");

#endif

#ifdef C_PROGRESSIVE_SUPPORTED

  fprintf(stderr, "  -progressive   Create progressive JPEG file\n");

#endif

  fprintf(stderr, "Switches for advanced users:\n");

  fprintf(stderr, "  -restart N     Set restart interval in rows, or in blocks with B\n");

  fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");

  fprintf(stderr, "  -outfile name  Specify name for output file\n");

  fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");

  fprintf(stderr, "Switches for wizards:\n");

#ifdef C_ARITH_CODING_SUPPORTED

  fprintf(stderr, "  -arithmetic    Use arithmetic coding\n");

#endif

#ifdef C_MULTISCAN_FILES_SUPPORTED

  fprintf(stderr, "  -scans file    Create multi-scan JPEG per script file\n");

#endif

  exit(EXIT_FAILURE);

}





LOCAL int

parse_switches (j_compress_ptr cinfo, int argc, char **argv,

		int last_file_arg_seen, boolean for_real)

/* Parse optional switches.

 * Returns argv[] index of first file-name argument (== argc if none).

 * Any file names with indexes <= last_file_arg_seen are ignored;

 * they have presumably been processed in a previous iteration.

 * (Pass 0 for last_file_arg_seen on the first or only iteration.)

 * for_real is FALSE on the first (dummy) pass; we may skip any expensive

 * processing.

 */

{

  int argn;

  char * arg;

  boolean simple_progressive;

  char * scansarg = NULL;	/* saves -scans parm if any */



  /* Set up default JPEG parameters. */

  simple_progressive = FALSE;

  outfilename = NULL;

  cinfo->err->trace_level = 0;



  /* Scan command line options, adjust parameters */



  for (argn = 1; argn < argc; argn++) {

    arg = argv[argn];

    if (*arg != '-') {

      /* Not a switch, must be a file name argument */

      if (argn <= last_file_arg_seen) {

	outfilename = NULL;	/* -outfile applies to just one input file */

	continue;		/* ignore this name if previously processed */

      }

      break;			/* else done parsing switches */

    }

    arg++;			/* advance past switch marker character */



    if (keymatch(arg, "arithmetic", 1)) {

      /* Use arithmetic coding. */

#ifdef C_ARITH_CODING_SUPPORTED

      cinfo->arith_code = TRUE;

#else

      fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",

	      progname);

      exit(EXIT_FAILURE);

#endif



    } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {

      /* Enable debug printouts. */

      /* On first -d, print version identification */

      static boolean printed_version = FALSE;



      if (! printed_version) {

	fprintf(stderr, "Independent JPEG Group's JPEGTRAN, version %s\n%s\n",

		JVERSION, JCOPYRIGHT);

	printed_version = TRUE;

      }

      cinfo->err->trace_level++;



    } else if (keymatch(arg, "maxmemory", 3)) {

      /* Maximum memory in Kb (or Mb with 'm'). */

      long lval;

      char ch = 'x';



      if (++argn >= argc)	/* advance to next argument */

	usage();

      if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)

	usage();

      if (ch == 'm' || ch == 'M')

	lval *= 1000L;

      cinfo->mem->max_memory_to_use = lval * 1000L;



    } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {

      /* Enable entropy parm optimization. */

#ifdef ENTROPY_OPT_SUPPORTED

      cinfo->optimize_coding = TRUE;

#else

      fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",

	      progname);

      exit(EXIT_FAILURE);

#endif



    } else if (keymatch(arg, "outfile", 4)) {

      /* Set output file name. */

      if (++argn >= argc)	/* advance to next argument */

	usage();

      outfilename = argv[argn];	/* save it away for later use */



    } else if (keymatch(arg, "progressive", 1)) {

      /* Select simple progressive mode. */

#ifdef C_PROGRESSIVE_SUPPORTED

      simple_progressive = TRUE;

      /* We must postpone execution until num_components is known. */

#else

      fprintf(stderr, "%s: sorry, progressive output was not compiled\n",

	      progname);

      exit(EXIT_FAILURE);

#endif



    } else if (keymatch(arg, "restart", 1)) {

      /* Restart interval in MCU rows (or in MCUs with 'b'). */

      long lval;

      char ch = 'x';



      if (++argn >= argc)	/* advance to next argument */

	usage();

      if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)

	usage();

      if (lval < 0 || lval > 65535L)

	usage();

      if (ch == 'b' || ch == 'B') {

	cinfo->restart_interval = (unsigned int) lval;

	cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */

      } else {

	cinfo->restart_in_rows = (int) lval;

	/* restart_interval will be computed during startup */

      }



    } else if (keymatch(arg, "scans", 2)) {

      /* Set scan script. */

#ifdef C_MULTISCAN_FILES_SUPPORTED

      if (++argn >= argc)	/* advance to next argument */

	usage();

      scansarg = argv[argn];

      /* We must postpone reading the file in case -progressive appears. */

#else

      fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",

	      progname);

      exit(EXIT_FAILURE);

#endif



    } else {

      usage();			/* bogus switch */

    }

  }



  /* Post-switch-scanning cleanup */



  if (for_real) {



#ifdef C_PROGRESSIVE_SUPPORTED

    if (simple_progressive)	/* process -progressive; -scans can override */

      jpeg_simple_progression(cinfo);

#endif



#ifdef C_MULTISCAN_FILES_SUPPORTED

    if (scansarg != NULL)	/* process -scans if it was present */

      if (! read_scan_script(cinfo, scansarg))

	usage();

#endif

  }



  return argn;			/* return index of next arg (file name) */

}





/*

 * The main program.

 */



GLOBAL int

main (int argc, char **argv)

{

  struct jpeg_decompress_struct srcinfo;

  struct jpeg_compress_struct dstinfo;

  struct jpeg_error_mgr jsrcerr, jdsterr;

#ifdef PROGRESS_REPORT

  struct cdjpeg_progress_mgr progress;

#endif

  jvirt_barray_ptr * coef_arrays;

  int file_index;

  FILE * input_file;

  FILE * output_file;



  /* On Mac, fetch a command line. */

#ifdef USE_CCOMMAND

  argc = ccommand(&argv);

#endif



  progname = argv[0];

  if (progname == NULL || progname[0] == 0)

    progname = "jpegtran";	/* in case C library doesn't provide it */



  /* Initialize the JPEG decompression object with default error handling. */

  srcinfo.err = jpeg_std_error(&jsrcerr);

  jpeg_create_decompress(&srcinfo);

  /* Initialize the JPEG compression object with default error handling. */

  dstinfo.err = jpeg_std_error(&jdsterr);

  jpeg_create_compress(&dstinfo);



  /* Now safe to enable signal catcher.

   * Note: we assume only the decompression object will have virtual arrays.

   */

#ifdef NEED_SIGNAL_CATCHER

  enable_signal_catcher((j_common_ptr) &srcinfo);

#endif



  /* Scan command line to find file names.

   * It is convenient to use just one switch-parsing routine, but the switch

   * values read here are ignored; we will rescan the switches after opening

   * the input file.

   */



  file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE);

  jsrcerr.trace_level = jdsterr.trace_level;



#ifdef TWO_FILE_COMMANDLINE

  /* Must have either -outfile switch or explicit output file name */

  if (outfilename == NULL) {

    if (file_index != argc-2) {

      fprintf(stderr, "%s: must name one input and one output file\n",

	      progname);

      usage();

    }

    outfilename = argv[file_index+1];

  } else {

    if (file_index != argc-1) {

      fprintf(stderr, "%s: must name one input and one output file\n",

	      progname);

      usage();

    }

  }

#else

  /* Unix style: expect zero or one file name */

  if (file_index < argc-1) {

    fprintf(stderr, "%s: only one input file\n", progname);

    usage();

  }

#endif /* TWO_FILE_COMMANDLINE */



  /* Open the input file. */

  if (file_index < argc) {

    if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {

      fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);

      exit(EXIT_FAILURE);

    }

  } else {

    /* default input file is stdin */

    input_file = read_stdin();

  }



  /* Open the output file. */

  if (outfilename != NULL) {

    if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {

      fprintf(stderr, "%s: can't open %s\n", progname, outfilename);

      exit(EXIT_FAILURE);

    }

  } else {

    /* default output file is stdout */

    output_file = write_stdout();

  }



#ifdef PROGRESS_REPORT

  start_progress_monitor((j_common_ptr) &dstinfo, &progress);

#endif



  /* Specify data source for decompression */

  jpeg_stdio_src(&srcinfo, input_file);



  /* Read file header */

  (void) jpeg_read_header(&srcinfo, TRUE);



  /* Read source file as DCT coefficients */

  coef_arrays = jpeg_read_coefficients(&srcinfo);



  /* Initialize destination compression parameters from source values */

  jpeg_copy_critical_parameters(&srcinfo, &dstinfo);



  /* Adjust default compression parameters by re-parsing the options */

  file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE);



  /* Specify data destination for compression */

  jpeg_stdio_dest(&dstinfo, output_file);



  /* Start compressor */

  jpeg_write_coefficients(&dstinfo, coef_arrays);



  /* ought to copy source comments here... */



  /* Finish compression and release memory */

  jpeg_finish_compress(&dstinfo);

  jpeg_destroy_compress(&dstinfo);

  (void) jpeg_finish_decompress(&srcinfo);

  jpeg_destroy_decompress(&srcinfo);



  /* Close files, if we opened them */

  if (input_file != stdin)

    fclose(input_file);

  if (output_file != stdout)

    fclose(output_file);



#ifdef PROGRESS_REPORT

  end_progress_monitor((j_common_ptr) &dstinfo);

#endif



  /* All done. */

  exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS);

  return 0;			/* suppress no-return-value warnings */

}

